Mill-liner.



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F. Jormsom. MILL LINER. APPLICATION FILED MAY 26, I9l6.

Patented Dec. 5, 1916.

FRANK E. JOHNSON, 01F SALT LAKE CITY, UTAH, ASSIG-NOR T0 AMERICAN MANGANESE STEEL COMPANY, "OF AUGUSTA, MAINE, A CORPORATION OF MAINE.

MILL-LINER.

To all whom it may concern:

Be it known that I, FRANK E. JOHNSON, a citizen of the United States, and a resident of Salt Lake City, in the county of Salt Lake and State of Utah, have made and invented certain new and useful Improvements in Mill-Liners, of which the following is a specification.

My invention relates to liners for use in ball mills, and other similar machines.

It is'an object of the present invention to provide a liner composed of lining plates which are so joined that they may elongate slightly, under the severe hammering action to which they are necessarily exposedin service, without subjecting the mill shell to bursting strains, or causing the disarrangement of the lining plates themselves.

A further object is to provide an improved type of holding bar which spans the space between the edges of adjoining lining plates and securely locks the plates to the mill shell,

rendering unnecessary additional holding bolts through the plates proper, and also protecting the edges of the lining plates against mutilation.

A further object is to provide a liner which is so constructed that the proper cascading action of the contents of the mill will be obtained, and the holding bars and lining plates so constructed and oined that the mill may be rotated in either direction. The arrangement is such that although the holding bars and lining plates interlock, preventing their mutual disarrangement, one or more of the lining plates may be easily removed, or the holding bars replaced, as necessary.

Other objects and advantages will appear as the description proceeds, wherein it is to be understood that changes in the precise embodiment of the invention can be made with in the scope of what is claimed without departing from the spirit thereof.

The preferred embodiment of my inven tion is disclosed in the accompanying drawings, wherein:

Figure 1 is a view in vertical longitudinal section of the upper half of a tumbling barrel or ball mill, equipped with a liner embodying the characteristic features of my invention; Fig. 2 is a view in vertical section taken on the line 2-2 of Fig. 1; Fig. 3 is a fragmental view in perspective of one of the holding bars; Fig. i is a fragmental view Specification of Letters Patent.

Application filed May 26, 1916.

Patented Dec. 5, 1916. Serial No. 99,942.

A in perspective of one 'of the lining plates;

F1g. 5 is a view in section of a somewhat modified form of liner.

1 Referring specifically to the several views, the liner is formed of a plurality of plates 10, the exposed working surface 11 of which 1s preferably flat, while the rear surface 12 is curved to conform to the general outline of the mill shell 13. Heavy ribs 14: are provided at the side edges of each plate, and project above the rear surface 12, so as to contact with the mill shell and hold the plate spaced a slight distance therefrom. A heavy central rib 12, extending longitudinally of the rear surface 12, cooperates in holding the lining plate in its spaced position. The ribs 14 also project above the front working surface of the plates and form retaining flanges 15.

The lining plates are arranged within the mill shell, and held in proper and spaced position by bridged holding bars 16, these bars being provided with spaced sides 17, which receive the retaining flanges 15 therebetween, the lining plates and holding bars thus cooperating to prevent their mutual displacement. The holding bars are provided, at spaced intervals, with openings 18, through which extend bolts or similar holding means 19. The holding means or bolts project between the spaced sides of the lining plates and pass through suitable openings 20provided in the mill shell, and are rigidly secured thereto by the holding nuts 21. The rigid securement of the holding bars renders unnecessary the use of additional bolts extending through the lining plates proper, thus allowing the lining plates to be easily removed and replaced, as may be necessary.

The holding bars project inwardly, beyond the general plane of the working surface of the lining plates, and act as lifting members, preventing the contents of the mill from slipping, and insuring the proper eascading action. The heavy ribs with which the side edges of the lining plates are provided, prevent these edges from becoming flattened and mutilated, and the retaining flanges 15 prevent the holding bars from becoming shifted or moved, although subjected to severe shocks and thrusts, in both forward and rearward directions.

lln the somewhat modified form of liner disclosed in Fig. 5, thelining plates 22 are with the central ribs 27, these ribs cotiperat- .ing with the adjacent edges of the lining plates and preventing the displacement or dislo'dgment of the plates and holding bars.

The holding bars are provided with suitable openings 25, which aline with corresponding openings 26 in the mill shell, and are adapted to receive bolts, or analogous holding means therethrough, whereby the liner is rigidly anchored in place.

What I claim is 1. A liner comprising lining plates with ri'bs. at the side edges thereof, retaining 'flanges carried by said ribs, and bridged holding bars spanning the s ace between adjacent lining plates and em racing adjacent retaining flanges therebetween.

2. A liner consisting of lining plates with thickened ribs at the side edges thereof, said ribs projecting above the working faces of said plates and forming retaining flanges,

and holding bars provided with spaced sides receiving the retaining flanges of adjacent plates therebetween, and means projecting between the lining plates and engaging said holding bars and securing them in place.

3. A lining plate formed with thickened ribs at the side edges thereof, retaining flanges carried at the side edges of said plate projecting above the working surface thereof, and projecting above a portion only of the said thickened ribs.

4; A liner consisting of a lining plate with ribs at the side edges thereof, retaining flanges of relatively less width than the said ribs located at the side edges of said plates and projecting above the working faces thereof, and holding bars with spaced sides receiving the retaining flanges therebetween and bearing down on said ribs, and means for securing said holding bars in place.

Signed at Chicago in the county of Cook and State of Illinois this 23rd day of May A. D. 1916.

FRikNK E. JOHNSON.

Witnesses:

NELLIE C. BASON, EUGENE 0. Boom. 

